JIS 1173 double head bolt [1]standards:DIN 835,DIN 938,JIS1173 [2]material:carbon Steel , Stainless steel [3]surface:zinc JIS 1173 double head boltWe also supply hex head bolt, heavy hex structural bolt,hex fit bolt,hex flange bolt,flat countersunk square neck bolts,cup head nid bolts,single-head bolt,double head bolt. JIS 1173 double head bolt